#1
(anchoring is not the right word; think resting) I've heard that anchoring the forearm to the guitar is a good habit to develop because it gives the wrist a 'pivot point', such as here. Are there any advantages or disadvantages to this technique?
#3
I, er, don't think his forearm is anchored to any pivot point on the guitar, unless his sleeve is covering some seriously deformed arm... He's clearly moving his whole arm a lot of the time (as would only be sensible when sweeping across 6 strings...).
#5
do you mean his wrist on the bridge? mine and a lot of people i have seen play tens to brush against the bridge but only very lightly i feel it gives me a reference point to where i am on the guitar. but i think having any kind of pivot point would be counter productive.